Encoder Interface UVW / TTL Input
GB-12
3.3.3
Input signals channel 2
3.3.3.1 Signal tracks
At this TTL input encoder interface the signals A+ and B+ are electrically phase-shifted by
90° rectangular signals with the respective inverted tracks A- and B-.
Figure 3.3.3.1
Signal tracks A+ and B+
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3.3.3.2 Evaluation of the zero signal
The zero impulse is required to determine valid position points. In case of pure speed con-
trols the signal does not need to be connected. In the following signal sequence the maxi-
mum permissible length of the zero impulse of the encoder is visible. The zero signal will
be acquired if A+ ,B+ and N+ are at high level. By that there is only one valid position point
which is independent from the travel direction.
Figure 3.3.3.2
Evaluation of the zero signal
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